Digital interferometric demodulation of Placido mires applied to corneal topography

Details Digital interferometric demodulation of Placido mires applied to corneal topography Digital interferometric demodulation of Placido mires applied to corneal topography

2012-04-10

arxiv.org/abs/1204.2210v3

Physics

Optics

7 pages, 4 figures. arXiv admin note: substantial text overlap with arXiv:1204.1950

Scientific paper

This paper presents a novel digital interferometric method to demodulate Placido fringe patterns. This is a synchronous method which uses a computer-stored conic-wavefront as demodulating reference. Here we focus on the experimental aspects to phase-demodulate Placido mires applied to corneal topography. This synchronous method is applied to two topographic Placido images and their de-modulated corneal-slope deformation is estimated. This conic-interferometric method is highly robust against typical "noise" signals in Placido topography such as: reflected eyelashes and iris structures. That is because the eyelashes and the iris structures are high frequency "noisy" signals corrupting the reflected Placido mire, so they are filtered-out by this method. Digital synchronous interferometry is here applied for the first time to demodulate corneal topographic concentric-rings images (Patent pending at the USPTO).

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